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NaturalGIS / naturalgis_ntv2_transformations

A plugin for the QGIS Processing toolbox to allow users do Datum transformations with NTv2 grids
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NTv2_transformation for Bosnia and Herzegovina #49

Open gnssgrid opened 3 years ago

gnssgrid commented 3 years ago

Hello I want to perform Ntv2 transformation between old and new CRS. Unfortunately new CRS is not in EPSG database. Here are parameters for old and new crs: Old crs: +proj=tmerc +lat_0=0 +lon_0=15 +k=0.9999 +x_0=5500000 +y_0=0 +ellps=bessel +proj=tmerc +lat_0=0 +lon_0=18 +k=0.9999 +x_0=6500000 +y_0=0 +ellps=bessel +proj=tmerc +lat_0=0 +lon_0=21 +k=0.9999 +x_0=7500000 +y_0=0 +ellps=bessel New crs: +proj=tmerc +lat_0=0 +lon_0=18 +k=0.9999 +x_0=500000 +y_0=0 +ellps=GRS80 Unfortunately I can't share NTv2 file, because I developed inside my dissertation, and it can't be shared until I get permission from geodetic authority. Is it possible to add this to your plugin? Thanks

gioman commented 3 years ago

@gnssgrid to be able to add this transformation is needed:

1) the NTV2 grid, that must have a clear license allowing redistribution

2) a few hours of work, that we won't do in our free time, feel free to hire us if you need (unless of course you want to send in a pull request with the necessary code changes, this is also welcome).

Cheers!

gnssgrid commented 3 years ago

@gioman Unfortunatelly I can't distribute NTv2 at this moment. Thanks anyway.

gioman commented 3 years ago

Unfortunatelly I can't distribute NTv2 at this moment. Thanks anyway.

@gnssgrid the plugin does not work without the binary ntv2 grid file.

gnssgrid commented 3 years ago

@gioman as I said I developed both ASCII and binary NTv2, but I can't distribute it because I don't have necessary permissions.

Regards

gioman commented 3 years ago

@gioman as I said I developed both ASCII and binary NTv2, but I can't distribute it because I don't have necessary permissions.

@gnssgrid yes I read that, I just said that there is no point in asking to add this transformation if the binary grid file cannot be made available (and redistributed).

gnssgrid commented 3 years ago

@gioman OK. I will let you know if I get permission to distribute it free.